Foods (Kitab Al-At'imah)
Dawud :: Book 27 : Hadith 3818
Narrated Mu'awiyah ibn Qurrah:
The Apostle of Allah (peace_be_upon_him) forbade these two plants (i.e. garlic and onions), and he said: He who eats them should not come near our mosque. If it is necessary to eat them, make them dead by cooking, that is, onions and garlic.